tính nhanh
\(\frac{3,4\cdot0,26\cdot2+6,8\cdot0,74}{7,4\cdot6,8\cdot2-6,8\cdot4,8}\)
GIẢI NHANH HỘ TỚ
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tính nhanh
\(\frac{3,4\cdot0,26\cdot2+6,8\cdot0,74}{7,4\cdot6,8\cdot2-6,8\cdot4,8}\)
GIẢI NHANH HỘ TỚ
\(c,1.2.3...9-1.2.3...8-1.2.3...7.8^2\)
\(=1.2.3...8\left(9-1-8\right)\)
\(=1.2.3...8.0\)
\(=0\)
\(d,\frac{\left(3.4.2^{16}\right)^2}{11.2^{13}.4^{11}-16^9}\)
\(=\frac{3^2.4^2.2^{32}}{11.2^{13}.\left(2^2\right)^{11}-\left(2^4\right)^9}\)
\(=\frac{3^2.2^4.2^{32}}{11.2^{13}.2^{22}-2^{36}}\)
\(=\frac{3^2.2^{36}}{11.2^{35}-2^{36}}\)
\(=\frac{3^2.2^{36}}{2^{35}\left(11-2\right)}\)
\(=\frac{3^2.2^{36}}{2^{35}.9}\)
\(=\frac{3^2.2^{36}}{2^{35}.3^2}\)
\(=2\)
\(\frac{27^3.4^5}{6^8}:\left(\frac{5^5.2^4}{10^4}:\frac{6^4}{2^6.3^4}\right)\)
\(=\frac{3^9.2^{10}}{6^8}:\left(5:\frac{1}{2^2}\right)\)\(=3.2^2:20=\frac{12}{20}=\frac{3}{5}\)
\(\frac{27^3.4^5}{6^8}:\left(\frac{5^5.2^4}{10^4}:\frac{6^4}{2^6.3^4}\right)\)
\(=\frac{\left(3^3\right)^3.\left(2^2\right)^5}{\left(3.2\right)^8}:\left(\frac{5^5.2^4}{\left(5.2\right)^4}:\frac{\left(2.3\right)^4}{2^6.3^4}\right)\)
\(=\frac{3^9.2^{10}}{3^8.2^8}:\left(\frac{5^5.2^4}{5^4.2^4}:\frac{2^4.3^4}{2^6.3^4}\right)\)
\(=3.2^2:\left(5:\frac{1}{2^2}\right)\)
\(=3.4:\left(5.4\right)\)
\(=12:20\)
\(=\frac{12}{20}=\frac{3}{5}\)
\(B=4.\left(\frac{1}{1.2}+\frac{1}{2.3}+...+\frac{1}{29.30}\right)\)
\(B=4.\left(1-\frac{1}{2}+\frac{1}{2}-\frac{1}{3}+...+\frac{1}{29}-\frac{1}{30}\right)\)
\(B=4.\left(1-\frac{1}{30}\right)\)
\(B=4.\frac{29}{30}\)
\(B=\frac{58}{15}\)
\(6,8\cdot3+6,8\cdot2+13,6\cdot2+6,8\)
\(=6,8\cdot3+6,8\cdot2+6,8\cdot2\cdot2+6,8\)
\(=6,8\cdot3+6,8\cdot2+6,8\cdot4+6,8\)
\(=6,8\cdot\left(3+2+4+1\right)\)
\(=6,8\cdot10\)
\(=68\)
nha !!!
6,8x3+6,8x2+13,6x2+6,8
= 6,8x3+6,8x2+6,8x2x2+6,8
=6,8x(3+2+4+1)
=6,8x10
=68